ESR detection procedure of irradiated papaya containing high water content

ESR signals were recorded from irradiated papaya at liquid nitrogen temperature (77 K), and freeze-dried irradiated papaya at room temperature (295 K).Two side peaks from the flesh at the liquid nitrogen temperature indicated a linear dose response for 3–14 days after the γ-irradiation. The line shapes recorded from the freeze-dried specimens were sharper than those at liquid nitrogen temperature.